Furnace



(No Model.)

' A. H. WOODRUPP.

FURNACE.

No. 526,475. Patented Sept. 25, 1894.

S d/ i OZ 1 K:- I 1 a? w A h WITNESSES: INVENTOR.

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AUGUSTUS H. WOODRUFF, or vAILsBURe, New JERSEY.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 526,475, dated September 25 1894. Application filed January 16,1894. seriainmtemorz. (No model.)

To all whom it may concern.-

Be it known that I, AUGUSTUS H. WOOD- ence being had to theaccompanying drawings, and to letters of reference marked thereon,

which form a part of this specification.

My invention relates to new and useful improvements in hot-air furnaces, and consists 1n certain arrangements and combinations of parts, such as will be hereinafter more fully described and finally embodied in the clauses of the claim.

The invention isillustrated in the accompanying sheet of drawings, in which-- Figure 1 is a vertical section of a portable furnace provided with the said outer casing or shell, and Fig. 2 is a top view of the same. Fig. 3 is a detail view'representing in crosssection, a portion of the lower castingof' the furnace, which is provided with a lip or flange for the support of the outer shell or casing, and also illustrating in'connectiontherewith, a ring, upon which the inner shell or casing is supported, said ring being provided with openings for the admission of the cold air behind the inner shell or casing of the furnace.

Similar letters of reference ,are employed in each of the above described views to indicate corresponding" parts.

In said drawings, A indicates any suitable form of hot air furnace, provided with the smoke-pipc a and an inlet a and door a a is the ash pit and a any suitable form of grate. l r

In Fig. 1, b indicatesa suitablebase, which is preferably of cast metal, and is provided at the top, as will be seen from Fig. 3, with an outwardly flaring and curved ring-shaped portion 12', having an annular flange b substantially as shown. Upon the inner edge 19 of said casting b is arranged a metal ring 0 provided with an annular flange or supporting ledge c,

which rests upon the said edge 6 in such a manner, that a portion 0 of said ring 0 projects down into said base I). In said ring 0 Upon said flange c is arranged the inner casing or shell d, preferably made of black iron, which casing or shell is provided at the top with a coneshaped dome d, from which radiate the hot air fiues (1 as will be seen from Fig. 2. Upon said annular flange b of the said base b, is arranged an outer shell or casing e,

to which is secured on the top thereof, in any well-known manner, a suitably shaped cover 6' having an opening e with which connects the opening of a cold air duct f. e As will be seen from Fig. 1, the cold air taken into said coldair duct f, strikes said dome d and is evenly distributed over the entire surface thereof, passing down between the inner shell or casing d and the outer shell or casing e,

into the jacket formed bysaid casings, from which the air finally passes through the openings c in the ring 0, around the body portion A of the furnaceto be heated and then forced into the hot air flues 01 as indicated by the arrows, shown in said Fig. 1.

. By the arrangement of a cold air jacket to be used in connection with a hot air furnace, many advantages are the result. In the first place, the cold air entirely surrounds the hot casing or shell d and during its downward course becomes warm. On the other hand, the outer shell or casing 6 remains perfectly cold and there is a great saving of the heat usually lost by radiation from the casings of furnaces as now made.

By the arrangement of an air duct to supply fresh air to the top of the furnace, the air strikes the center of the dome d, and is thereby equally distributed, furnishing every part of the furnace with a fresh supply of air. It also does away with the use of an underground pit and air duct, thus preventing damp and foul air from entering the furnace, and finally, the arrangement and combinations of the parts herein shown and described, result in a cheaper and better construction in every way.

The outer casing or shelle is usually made of galvanized iron.

Having thus described my invention, What I c1airn-is- 1. In a hot air furnace, in combination, with the furnace proper, comprising therein a base I), having a ring-shaped portion 1), provlded with a flange 12 a ring 0, provided with openings, arranged on said ring-shaped portion b, a shell or casing 01 connected with sald ring 0 and having a dome d, an outer shell or casing e arranged on said flange b of the base I), and provided with a cover 6', said shellsor casings forming a cold air jacket, and a cold air duct leading into said jacketf substantially as and for the purposesset forth. 2. In a hot air furnace, in combination, with the furnace proper, comprising therein a base I), having a ring-shaped portion 1)", provided with a flange b2, a ring 0, provided with a flange or supporting ledge c',-a flange c and openings 0 a shell or casing 01 connected with said ring 0, an outer shell or cassing 6 arranged on said flange b of said base I), and provided with a cover 6, said shells or casings forming a cold air jacket, and a cold air duct leading into said jacket, substantially as and for the purposes set forth.

In testimony that I claim the invention set forth above I have hereunto set my hand this 13th day of January, 1894:.

AUGUSTUS H. WOODRUFF.

Witnesses:

FREDK. O. FRAENTZEL, WM. 1H. "CAMFIELD, Jr. 

